When Outlook crashes, does it present you with any error (and if yes, what does it state)? Please also include all info that you consider helpful in replicating your issue – what are you doing before, what other add-ins you have installed etc.

Error occurs as Outlook starts. It will keep occuring during each restart. Removing the Bells and Whistles plugin resolves the issue. Reinstalling Bells and Whistles causes the problem once again. The addins I am using:

Not sure we have the same problem but using Exchange server 2010 and outlook 2010 windows server 2008 all B&W programs freeze as soon as you accept the OK button for the tip window that appears if licenced or the try now if on trial